What is the best way to define const strings when there are separate header and source files?

For example, I have a header that only declare some enums. In that same header I would like to add string representations of those enums so that I can print them easily i.e string_representation[my_enum] for debug and error printing and so on.

If I define them in the header file, I will get a linker error for multiple definitions. If I remove the definition, then I can not define it in the source file.